Botulinum toxin type A treatment in children with spastic cerebral palsy: documentation of the short-term effect with general motor function-measure (GMFM) - Zafeiriou, DI; Pavlou, E; Vargiami, E; Hytopoulos, A; Tryfonas, D; Kontopoulos, E; Tsikoulas, I (Neuropediatrics, 2004)